First try ;-)

1 job for master in 30 minutes and 6 seconds (queued for 3 seconds)
Name Stage Failure
build Build There is an unknown failure, please try again
if custom ./configure arguments are necessary, see docker-php-ext-configure

Possible values for ext-name:
bcmath bz2 calendar ctype curl dba dom enchant exif fileinfo filter ftp gd gettext gmp hash iconv imap interbase intl json ldap mbstring mysqli oci8 odbc opcache pcntl pdo pdo_dblib pdo_firebird pdo_mysql pdo_oci pdo_odbc pdo_pgsql pdo_sqlite pgsql phar posix pspell readline recode reflection session shmop simplexml snmp soap sockets sodium spl standard sysvmsg sysvsem sysvshm tidy tokenizer wddx xml xmlreader xmlrpc xmlwriter xsl zend_test zip

Some of the above modules are already compiled into PHP; please check
the output of "php -i" to see which modules are already loaded.
The command '/bin/sh -c apt-get update && apt-get install -y git mariadb-client openssh-client libfreetype6 libpng16-16 libjpeg62-turbo gettext libmcrypt4 libxslt1.1 libicu57 && apt-get install -y libfreetype6-dev libpng-dev libjpeg62-turbo-dev libmcrypt-dev libxslt1-dev libicu-dev && docker-php-ext-configure gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/ && docker-php-ext-install -j$(getconf _NPROCESSORS_ONLN) gd bcmath soap gettext mcrypt mysqli pdo_mysql opcache xsl zip intl calendar && apt-get remove -y libfreetype6-dev libpng-dev libjpeg62-turbo-dev libmcrypt-dev libxslt1-dev libicu-dev && rm -rf /var/lib/apt/lists/*' returned a non-zero code: 1
ERROR: Job failed: exit code 1